$7\mathrm{.}4\mathrm{.}1$: Character operations.

$601270\mathrm{.}2853880.$qx$3$zqy$7$

Jump to level $1$

Variable inString is assigned with a $2-$character string read from input. If inString's first and second characters are the same regardless of case, output "Valid string". Otherwise, output "Invalid string".

Ex $1$: If the input is Ss$,$ then the output is:

Valid string

Ex $2$: If the input is q$\%,$ then the output is:

Invalid string